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Overview
Adds a healthcheck that loads some metadata about a tiff. If the tiff location has moved, the healthcheck throws a warning, but does not error out (in case the image is accidentally moved).
Checklist
Demo
This screenshot is a demo of what the logs look like when the image has moved:
Notes
It is unclear if this is going to work as far as making sure that servers that pass healthchecks but can't serve tiles no longer do that. It is not possible to reproduce this in development so the only way to test I think is to push it out and test.
Testing Instructions
localhost:8080/healthcheck
Closes #4945